Grinding wheel dressing device



April 26, 1960 A. WEINING GRINDING WHEEL DRESSING DEVICE Original Filed Oct. 26, 1956 2 Sheets-Sheet 1 FIG. 3

INVENTOR- ANDREW WEINING FIG I BYMX/Ml ATTORIEY April 26, 1960 A. WEINING GRINDING WHEEL nmassmc DEVICE Original Filed on. 26. 1956 2 Sheets-Sheet 2 Fl G. 5

INVENTOR.

ANDREW WEINING BY M ATTORNEY GRINDING WHEEL DRESSING DEVICE Andrew Weining, Erie, Pa.

Substituted for abandoned application Serial No. 613,637, October 26, 1956. This application January 9, 1958, Serial No. 707,957

2 Claims. (Cl. 125-11) This invention relates to grinding wheels and, more particularly, to means for precision dressing grinding wheels.

This application constitutes a substitute application of patent application, Serial No. 618,637, filed October 26, 1956, which has been abandoned.

In the dressing of grinding wheels, it is often done by a hand tool held by the operator of the machine which is held into engagement with the wheel. There is no way of the operators knowing when the wheel has been completely brought to a precision surface and, therefore, there is a likelihood that the operator will remove an excess amount of material from the surface of the wheel. Further, in the dressing of wheels with mechanical features as has been heretofore proposed, the fixtures are inclined to vibrate excessively with the machine to which they are attached. This, therefore, results in an irregular dressing surface on the wheel.

According to the present invention, means is provided which permits the dressing of the surface of the wheel to take off any high spots or irregularities Without removing an excess amount of material from the wheel, the dressing tool being supported on a simple support with a simple efiicient structure.

By providing a simple mechanism which can be controlled with high precision with the joints thereof connected by means of resilient vibration absorbent material, it is possible to provide a dressing device which will dress the surface of a grinding wheel to an extremely accurate dressed surface. In addition, the resilient mounts for the device prevent the diamond point from being broken.

It is, accordingly, an object of this invention to overcome the defects of previous grinding wheel devices and, more particularly, it is an object of this invention to provide a truing apparatus for a grinding wheel which is simple in construction, economical to manufacture, and simple and efficient in operation.

Another object of this invention is to provide a simple grinding wheel truing apparatus which can be made with a minimum number of parts for truing the operative face of a grinding wheel.

A further object of this invention is to provide a truing apparatus of a simple and rugged construction which enables an operator to true the Wheel face of a grinding wheel.

A still further object of the invention is to provide a truing apparatus which is detachably arranged to true the face of a grinding wheel accurately and positively.

With the above and other objects in view, the present invention consists of the combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawings and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportions, and minor details of construction without departing from the spirit or sacrificing any of the advantages of the invention.

2,934,057 Patented Apr. 26, 1960 ice In the drawings:

Fig. l is a partial cross sectional view of a grinding machine according to the invention;

Fig. 2 is a cross sectional view taken on line 2--2 of Fig. 1;

Fig. 3 is a view of a clamp for attaching a truing device to a part of the machine shown in Fig. 1;

fig. 4 is a view of another embodiment of the invention; and

Fig. 5 is a cross sectional view taken on line 55 of Fig. 4.

Now with more specific reference to the drawings, by way of example, a wheel 10 is shown having a safety guard 11 supported therearound in conventional fashion. A wheel truing device 40a is attached to the wheel guard 11 by means of a clamp 12 which is attached to the guard 11 at 13 and to a bracket 15 engaged by a pintle 16. The bracket 15 rests on the side of the guard 11 on pads 17 which are supported in rubber bushings 18 to minimize noise and vibration and, therefore, to provide a more accurate truing action on the wheel 10.

An arm 19 is pivotally connected to the bracket 15 by means of a stud 20 which threadably engages the bracket 15 at 21 and is spaced from the guard 11 by means of a rubber bushing 22. Spaced parallel shafts or bolts 23 are attached to the arm 19 by means of nuts 25 which are threadably supported on the bolts 23. The bolts 23 extend into counterbored holes 26 and shoulders 27 on the bolts 23 engage countersunk shoulders in the holes 26 to lock the bolts 23 in position. A similar connection is provided on the other ends of the bolts 23 where they are held on a spacer 28 by means of nuts 29 and 30.

A tool holder 59 has parallel bores 63 which receive the shaft 23. A diamond point 31 is supported in a diamond holder 32 which is cylindrical in cross section and supported in the tool holder 59 by means of a clamping arrangement 32a which has a nut 33 thereon which threadably engages a diamond clamp screw 34a. Access to the head of the diamond screw 34a may be had through a hole 35 formed in the spacer 28 through which a screw driver may be inserted to adjust or remove the screw 34a. The tool holder 59 has rubber bushings 34 therein aligned with metal lined bushings 35a which slidably engage the shafts 23.

The angular position of the arm 19 relative to the wheel 10 is controlled by a set screw 37 which threadably engages the arm 19 at 38 and extends downwardly to engage an adjustable stop 3? at 40. The adjustable stop 39 is supported on the bracket 15 and locked thereto by means of a screw 41. The stop 39 may be further adjusted, if desired, to provide a desirable stop. This adjustment is made by loosening the screw 41 and rotating the stop 39 toa new position and locking it there by tightening the screw 41.

The clamp 12 used to clamp the device to the machine has a body 42 which is U-shaped and has the pintle 16 disposed in a hole 4-3. The pintle 16 has a head and a reduced size portion which are in turn received in a hole in the bracket 15. The clamp 12 has a threaded clamp ing bolt 44 having a handle 45 thereon and a wheel guard engaging member 46. By means of the clamp 12, the wheel dressing device can be clamped to or removed from the frame of a grinding wheel.

in use, when the wheel 10 is desired to be trued, the set screw 37 will be retracted until the diamond point 31 barely engages the highest spot on the wheel 10. Then the tool holder 59 will be moved back and forth along the shaft 23 and as the wheel 10 is trued, the set screw 37 will be loosened slightly so that a deeper cut in the surface of the wheel 10 can be taken. By use of the 3 tool truing'device disclosed herein, it is possible to true the surfaceof a wheel accurately and without removing excess material since the set screw 37 can be accurately adjusted with very little effort, skill, or care.

Figs. 4 and 5 show another embodiment of the invention. An arm 119 is preferably made identical to the arm 19 shown in Fig; 1. The arm 119 has a countersunk bore 127 therein which receives a rounded end 126 of a square shaft 123. An end 126a is threaded "to receive a nut 125 which engages a washer 150. A tool holder 159 has a bore 170 therein which receives a cylindrical diamond-holder 132 which has a diamond point 131 attached to the end thereof. The diamond holder 132 is'held in place by a set screw 172.

The too-l holder 159 is rectangular in cross section as shown in Fig. 4'and has a lateral slot 173 formed therein which intersects a square lateral bore 174. The lateral bore 174 receives the square shaft 123. A screw 178 is 'provided in a countersunk threaded hole 179 and the to be dressed and disposed in a plane parallel to the plane of said wheel and at the side thereof, an arm swingably attached to said bracket, said arm having a set screw therein spaced from the connection of said arm with said bracket and extending perpendicular to the axis of said swinging attachment, a stop on said bracket, said stop being swingably attached to said bracket by means of a screw extending therethrough and threadably engaging said bracket to lock said stop in a position generally parallel to'said arm, said stop being swingable in a plane parallel to the plane of said wheel, one end of said set screw engaging said stop on said bracket, a

. square shaft attached to said bracket and extending i laterally therefrom generally parallel to said axis of swinging of said arm, a tool carrier having a square hole therein slidably receiving said square shaft, said square shaft further extending parallel to the axis of rotation of said wheel to be dressed, and a diamond supported in a dia- A round washer 183 is attached to the end of the square The square lateral bore 174 in the tool holder 159 has 7 counterbores 186 formed in either side thereof. The bores 186 receive felt washers 186a which are supported in place by means of end plates 187 and the end plates 137 are held in place by means of screws 188. The felt washers 186a perform a dual function of retaining lubricant for the shaft 123 and, also, cleaning ofi stray particles of material and preventing stray particles from sliding under the bore, the tool holder 159, and the outer surface of the shaft 123.

The operation of the device shown herein will be the same as the operation of the device shown in Figs. 1, 2, and 3 with the exception that the holder 159 and the shaft 123 will be supported on a bracket like the bracket or arm 119 and will be adjusted in a similar manner.

The foregoing specification sets forth the invention in its preferred practical forms but the structure shown is capable of modification within a range of equivalents without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A wheel dressing device comprising a bracket adapted to be attached to the frame of a grinding wheel mond carrier on said tool carrier, said screw comprising means to adjust said diamond toward and away' from said wheel in said tool carrier.

2. A wheel dressing device comprising a bracket, means to attach said bracket to a frame'of a grinding wheel to be dressed and disposed in a plane parallel to the plane of said wheel and at the side thereof, an arm swingably mounted on said bracket, means to adjustably lock said arm in angular relation to said bracket, a square shaft attached to said arm and extending laterally therefrom parallelto the axis of rotation of said wheel, a tool holder having a square bore therein, said square bore receiving said square shaft, a diamond holder attached to said tool holder, said tool holder being slotted. parallel to said square shaft, means to clamp said slotted end of said tool holder to said shaft, counterbores in the square opening through said tool holder, felt disposed in said counterbor'es, and a cover concentric with said square shaft and attached to said tool holder holding said felt in said counter-bores and in sliding engagement with said shaft.

References Cited in the file of this patent UNITED STATES PATENTS 1,110,424 Davenport Sept. 15, 1914 1,294,541 Rundquist Feb. 18, 1919 1,324,497 Koning Dec. 9, 1919 1,790,245 Norton Jan. 27, 1931 1,856,180 v Allison May 3,1932 2,102,841 Fuller -4 Dec. 21, 1937 2,369,405 Pollard et al. Feb. 13, 1945 2,451,235 Nagy et al. Oct. 1-2, 1948 a linden 

